Effects of nonylphenol on zooplankton in aquatic microcosms

Severin, Gabriele F.; Welzl, Gerhard; Jüttner, Ingrid; Pfister, Gerd; Schramm, Karl‐Werner

doi:10.1897/02-189

Cited by 17 publications

(27 citation statements)

References 37 publications

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“…We found greater variability of most of the behavior of controls than in previous studies with the same test design [15,16]. This variability already appeared during the preapplication period and led to such high divergence between microcosms that mixing of the microcosms before starting the treatment became necessary.…”

Section: Discussioncontrasting

confidence: 44%

“…Our experience showed that during this pre-application period variability is high, becoming lower after about 5 to 6 weeks (for example Refs. [15] and [ 16]). Therefore mixing might also have resulted in increased instability.…”

Section: Discussionmentioning

confidence: 98%

“…to investigate the effects of EE on an aquatic ecosystem as a reference for studies with other suspected estrogenic endocrine disruptors, for example nonylphenol [15,16], and 2. to estimate whether EE itself can interfere with the ecosystem.…”

Section: Introductionmentioning

confidence: 99%

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Effects of 17?-ethinylestradiol on zoo- and phytoplankton in lentic microcosms

Hense

Severin²,

Welzl³

et al. 2004

Analytical and Bioanalytical Chemistry

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The effects of 17 alpha-ethinylestradiol (EE), an endocrine disruptor, on zoo- and phytoplankton were studied in outdoor 230-L still-water microcosms. Cell density and biomass, diversity, and community composition were analyzed. Five microcosms were treated by controlled release for six weeks, three by direct application of EE. To investigate recovery, sampling was continued for four weeks after treatment. Most characteristics of the zooplankton were not unambiguously affected by EE. Only the relative density of copepods, especially of their larvae, decreased significantly after EE application. For phytoplankton, no unambiguous concentration- or toxodose-correlated effects on any biotic characteristics could be found. However, most properties of the phytoplankton deviated from those of controls, i.e. tended to be smaller (number of species per microcosm, biomass, cell density) or covered a wider range (diversity, evenness). PCA indicated a shift of species structure in the treated microcosms. This was supported by the species scores calculated by the principal response curve method, although the principal response curve itself showed no clear EE-correlated shifts. High variability within the biocenosis between microcosms and over time, probably because of disturbance of the ecosystem before starting of the test, might have superimposed EE-dependent effects.

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Section: Discussioncontrasting

confidence: 44%

Section: Discussionmentioning

confidence: 98%

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Effects of 17?-ethinylestradiol on zoo- and phytoplankton in lentic microcosms

Hense

Severin²,

Welzl³

et al. 2004

Analytical and Bioanalytical Chemistry

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“…The water and sediment contained the natural plankton and benthic communities with periphyton and macrophytes ( Potamogeton sp., Chara sp.) developing over the test period [14,15]. Water temperatures varied between 18 and 28°C.…”

Section: Methodsmentioning

confidence: 99%

Controlled release experiments with nonylphenol in aquatic microcosms

Pfister

Jüttner

Severin

et al. 2003

Enviro Toxic and Chemistry

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A method of controlled release of technical nonylphenol (tNP) was developed to simulate realistic exposure in ecotoxicological studies on aquatic organisms. The direct addition of tNP from an aqueous stock solution into 50 ml of water led to a concentration decrease of 80 to 90% weight/volume (w/v) from nominal values within 48 h. The inclusion of tNP in semipermeable low-density polyethylene (LDPE) lay-flat tubing (controlled-release devices [CRDs]) of different length allowed a continuous release into pure water at a rate of about 30 microg/cm2/d. Using CRDs in aquaria containing 15 L of 63-microm-filtered lake water, eight different concentrations with maxima between 38.1 and 326.7 microg/L were maintained for 11 d. During a second experiment in 15-L aquaria, five replicates of three concentrations were maintained using CRDs of the same length. Concentrations after 38 d varied between 0.1 and 6.7, 26.1 and 41.9, and 49.9 and 76.0 microg/L. In aquatic microcosms containing 230 L of lake water, a natural plankton community, 50 L of sediment, and macrophytes, seven different tNP concentrations (maxima 11-120.1 microg/L) were maintained over 45 d using CRDs of different length. They were replaced after 14 and 25 d because release of tNP was slower than predicted from laboratory experiments. Concentrations in the top 1-cm sediment layer were on average 19 times higher during the dosing period than concentrations in the water at the same time. In the sediments, different levels of applications led to concentrations that differed less distinctly than in the water. This method is suitable for exposing aquatic organisms continuously to constant, ecologically relevant concentrations of NP and represents an improvement over previous dosing methods in which exposure varied.

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“…There is some evidence that planktonic communities are sensitive to nonylphenol and 17α-ethinylestradiol, this latter compound is known to affect only copepod densities (Hense et al, 2004), whereas nonylphenol led to lower abundance of all zooplankters (Severin et al, 2003). It should be kept in mind that the effects observed might be mediated through non-endocrine mechanisms and may be a general toxic response.…”

Section: Rotifers As Tool For the Assessment Of Pharmaceuticals And Ementioning

confidence: 99%

Workshop on rotifers in ecotoxicology

Snell

Joaquim-Justo

2007

Hydrobiologia

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The aim of the workshop on rotifers in ecotoxicology was to stimulate discussions on new developments in the field. Discussions about the use of biomolecular tools indicate that gene expression analysis with rotifers should be available in the next few years. Such analyses will be a great asset as they enable ecotoxicologists to study molecular mechanisms of toxicity. Rotifers also appear as useful tools in the risk assessment of pharmaceuticals and their metabolites that find their way into aquatic ecosystems because their sensitivity to some of these substances is higher than that of cladocerans and algae. The nature and extent of the impact of potential endocrine disruptors on aquatic invertebrates is another poorly resolved issue for which rotifers are a promising tool. Indeed, rotifers seem to be particularly sensitive to androgenic and anti-antiandrogenic substances, whereas copepods and cladocerans are typically more affected by estrogens and juvenile hormone-like compounds. Besides their usefulness in these emerging fields of aquatic ecotoxicology, it was emphasized that research with rotifers on basic issues like, e.g., toxicant interference with predation, competition, or interspecific and interclonal variation in ecotoxicological tests is still needed.

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Effects of nonylphenol on zooplankton in aquatic microcosms

Cited by 17 publications

References 37 publications

Effects of 17?-ethinylestradiol on zoo- and phytoplankton in lentic microcosms

Effects of 17?-ethinylestradiol on zoo- and phytoplankton in lentic microcosms

Controlled release experiments with nonylphenol in aquatic microcosms

Workshop on rotifers in ecotoxicology

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